Create user gesture indicator for pointerup

third_party/WebKit/LayoutTests/fast/events/popup-allowed-from-pointerup-exactly-once.html

+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<p>
+    Test that only a single popup is allowed in response to a single
+    pointer up user action. The test passes if only one popup is created.
+</p>
+<button id="button">Tap Here</button>
+<div id="console"></div>
+<script>
+    document.getElementById('button').addEventListener('pointerup', pointer_popup);
+    function pointer_popup() {
+        assert_not_equals(window.open("about:blank", "window1"), null, "Popup didn't open in pointerup handler.");
+        assert_equals(window.open("about:blank", "window2"), null, "Popup should open only once in pointerup handler.");
+        done();
+    }
+
+    if (window.testRunner) {
+        testRunner.setPopupBlockingEnabled(true);
+        testRunner.setCloseRemainingWindowsWhenComplete(true);
+
+        if (window.eventSender) {
+            var button = document.getElementById("button");
+            eventSender.addTouchPoint(button.offsetLeft + button.offsetWidth / 2, button.offsetTop + button.offsetHeight / 2);
+            eventSender.touchStart();
+            eventSender.releaseTouchPoint(0);
+            eventSender.touchEnd();
+        }
+    }
+</script>